This part of GB/T 5070 specifies the method for determining the amount of alumina by EDTA volumetric method. This section applies to the determination of the amount of alumina in magnesia-chrome refractories. The measurement range (mass fraction) is 2.00% to 20.00%.
GB/T 5070.4-2002 history
2015GB/T 5070-2015 Chemical analysis of refractories containing chrome
2007GB/T 5070-2007 Chemical analysis of refractories containing chrome
2002GB/T 5070.4-2002 Chemical analysis of magnesia chromite refractories--Part 4: Determination of aluminium oxide--EDTA volumetric method
GB/T 5070.4-2002 Chemical analysis of magnesia chromite refractories--Part 4: Determination of aluminium oxide--EDTA volumetric method was changed to GB/T 5070-2007 Chemical analysis of refractories containing chrome.